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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13bd87076d59f74e84d38a15d14a4a864879c1c0f546394bdc74b1599c7c2ece' 
  AND token = '9zLbft0eW6IpOofNmm1KBJe7D6aHE0uZYZjou6+U0a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}